EP 0234089 A2 19870902 - Glare-proof transparent cover plate.
Title (en)
Glare-proof transparent cover plate.
Title (de)
Nichtreflektierende tranparente Deckplatte.
Title (fr)
Plaque de couverture transparente non-réfléchissante.
Publication
Application
Priority
- JP 2047486 A 19860131
- JP 4468886 A 19860228
Abstract (en)
The present invention provides a glare-proof transparent cover plate having: a back formed in a flat plane, and a front formed in parallel arrangement of minute sawtooth ridges, each ridge having a horizontal facet extending substantially perpendicularly to the flat plane and an inclined facet inclined at an angle to the flat plane. <??>The glare-proof transparent cover plate of the present invention is characterised in that it has any one or any combination of the following features: a) the angle alpha of the inclined facet relative to the flat plane satisfies the inequality alpha @>/=@( beta + omega ')/2, where alpha is the angle of refraction of incident rays of light within the transparent cover plate, and omega ' is the critical angle of the material forming the transparent cover plate; b) shading masks are formed in the inclined facet on at least part of an area through which reflected rays of light reflected by the inner surface of the horizontal facet among the rays of light penetrating the transparent cover plate are emitted into the field of vision; c) each horizontal facet is provided with irregularities capable of diffusing rays of light reflected within the transparent cover plate; or d) each inclined facet is provided with irregularities formed on at least part of an area through which reflected rays of light reflected by the inner surface of the horizontal facet are emitted into the field of vision.
IPC 1-7
IPC 8 full level
G02B 5/04 (2006.01)
CPC (source: EP US)
G02B 5/045 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0234089 A2 19870902; EP 0234089 A3 19890607; CA 1272409 A 19900807; US 4756603 A 19880712
DOCDB simple family (application)
EP 86306765 A 19860902; CA 523443 A 19861120; US 89916886 A 19860822